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|Noun||1.||dichromasy - a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision)|
color blindness, color vision deficiency, colour blindness, colour vision deficiency - genetic inability to distinguish differences in hue
red-green color blindness, red-green colour blindness, red-green dichromacy - confusion of red and green